Eugene Alvin Villar wrote: > One big problem with any 4th dimensional idea is plate tectonics. I'm > willing to bet that if you were to map how London was before the great > fire of 1666, the coordinates of places won't match their current > locations in WGS84 coordinates. And exactly how do you propose that we get accurate coordinates for the positions of streets in 1665 other using a modern surveyed overlay? I don't think Samuel Pepys supplemented his diary with GPS derived WGS84 coordinates. :-)
Any surveying that was done then (some rather accurately) would be done with reference to a fixed object on the landmass. These would have moved coherently on a tectonic plate. The 4 metres or so the plate bearing London has moved since the mid 17thC is only just within our current consumer GPS resolution and therefore on the boundary of our error range. Besides, all this plate movement is relative, who says London has moved at all? -- Cheers, Chris user: chillly _______________________________________________ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
